Contract Senior Software Engineer

EducationSuperHighway; Polska; Hybrid; PLN 381,000 - 653,000; Full time

Job summary

EducationSuperHighway is seeking a Senior Contract Software Engineer to join a small engineering team remotely and contribute to a critical payroll and giving platform. You will work directly with the platform designer and help extend integrations ahead of a 2027 launch.

You will make architecture decisions, tackle third-party integrations, and own parts of the codebase from build to launch and beyond. This is a contract role with a strong path to full-time for the right candidate.

Qualifications

• 7+ years of full-stack engineering experience building production web applications.
• Early-stage startup experience, comfort with ambiguity, building from 0 to 1 in a small team.
• Demonstrated use of AI coding tools as a regular part of development workflow (planning, coding, debugging, refactoring).
• Mature judgment about AI outputs: knowing when to trust, correct, or set tools aside.
• Strong third-party API integration experience, esp. with OAuth and payroll/HRIS APIs.
• Experience modeling relational data for complex, multi-tenant stateful workflows.
• Proven ability to build and maintain reliable background job pipelines with named queues and observability.
• Secure handling of PII and financial data.
• Comfort deploying and monitoring a production service with DevOps support.
• Clear communication in early-stage, ambiguous environments.

Responsibilities

• Build on the existing API-first full-stack platform and extend it toward launch.
• Integrate payroll and HRIS providers (Finch, ADP, Dayforce, Workday, UKG) with automated data sync and write-back.
• Build direct integrations for provider reach using Rippling and handle assisted connections.
• Maintain a provider-agnostic integration layer for adding new payroll providers.
• Develop enrollment flows and employer-facing dashboards for multiple employers and recipients on a multi-tenant platform.
• Design reliable background job pipelines with status tracking and error visibility.
• Support money movement and reconciliation with a payments/ledgering provider.
• Create compliant document workflows and year-end receipts delivery.

Skills

Full-stack engineering

Startup experience

AI coding tools usage

OAuth & API integration

Relational data modeling

Background job pipelines

PII and data security

Production deployment & monitoring

Clear communication in ambiguous env

Tools

Cursor

GitHub Copilot

Codex

Claude

Job description

Contract Senior Software Engineer

Employment Type: Contract/Hourly compensation | Location: Remote

About EducationSuperHighway

EducationSuperHighway, the national non-profit that connected 99.7% of American students to high-speed internet and 5 million low-income households to affordable broadband, is now launching its 3.0 mission: ending America’s K-12 reading crisis by funding literacy tutoring scholarships for first graders who are reading below grade level.

Beginning in 2027, the Federal Scholarship Tax Credit (FSTC, §25F) creates a new mechanism for employers to offer education philanthropy as a workplace benefit. ESH is building the infrastructure that makes this real, connecting employers, employees, and payroll systems into a seamless giving experience, and tracking every payroll deduction through to the scholarship granting organization that receives it.

About the Role

You will join ESH's small engineering team on this product, working directly with the engineer who designed the platform, stepping into an active build ahead of the January 1, 2027 launch. The platform's core architecture is already in motion: a mix of automated and manually-supported payroll provider integrations, a multi-tenant giving architecture that supports multiple downstream recipients per employer, a money movement and reconciliation layer built on a bank-sponsored payments provider, employer single sign-on, compliance checks against the IRS list of eligible scholarship granting organizations, and a growing set of live and in-progress employer implementations. You will help extend the integration layer, building on the existing architecture, and share ownership of the wider codebase, then carry that work through to launch and beyond.

You will make real architecture decisions, work on third-party integrations, and build the platform that brings this benefit to life for employers and employees nationwide. This engagement starts as a contract role with a strong path to full-time conversion for the right person.

What We Are Looking For

Required

• 7+ years of full-stack engineering experience building production web applications

• Early-stage startup experience, comfort with ambiguity, and experience building from 0 to 1 or picking up and extending an early-stage system alongside a small team

• Demonstrated use of AI coding tools such as Cursor, GitHub Copilot, Codex or Claude as a regular part of your development workflow, including planning, code generation, debugging, and refactoring

• Mature judgment about AI outputs: knowing when to trust, when to correct, and when to set the tools aside

• Strong third-party API integration experience, particularly OAuth flows and structured data write-back, ideally with payroll, HRIS, or other vendor APIs that are limited or inconsistent

• Experience modeling relational data for complex, multi-step, multi-tenant stateful workflows

• Proven ability to build and maintain reliable background job pipelines with named queue technology and operational visibility

• Secure handling of PII and financial data

• Comfort deploying and monitoring a production service (a dedicated DevOps/security engineer will support deeper infrastructure work)

• Clear communication and sound judgment in early-stage, ambiguous environments, including the ability to read into and build on an existing codebase quickly
  

Highly Valued

• Experience integrating with payroll or HRIS platforms directly or through an integration aggregator such as Finch, including UKG, Rippling, ADP, Dayforce, Workday, or similar

• Background in HR tech, benefits, workplace giving, or fintech

• Familiarity with payroll deduction mechanics or year-end tax document and compliance-driven document delivery workflows

• Experience designing a provider-agnostic abstraction layer for third-party integrations

• Experience with payments or financial data flows, such as ACH, ledgering, or reconciliation, where money must be tracked accurately and audited

• Experience with single sign-on and identity provider integrations (OIDC, SAML, Okta)

• Experience integrating with Salesforce or another CRM
  

What You Will Do

• Build on the existing API-first full-stack platform connecting employers, employees, and payroll systems, and extend it toward launch, working alongside the existing engineer

• Work with the existing engineer on integrations with payroll and HRIS providers (today primarily through the Finch aggregator, starting with ADP Workforce Now, with Dayforce, Workday, and UKG next), including both automated data sync and write-back and manually-supported implementation paths, with a roadmap to bring more providers under automation over time

• Build direct integrations for providers an aggregator cannot reach, starting with Rippling using custom objects, workflows, or file-based paths as needed. Handle assisted provider connections, where requests are applied by a person within about two business days, by treating a pending deduction as possibly already applied

• Maintain and extend a provider-agnostic integration layer so adding new payroll providers does not require rebuilding the core platform

• Build and refine employee-facing enrollment flows and employer-facing campaign and dashboard tooling, supporting multiple employers and multiple downstream giving recipients on a shared, multi-tenant platform, including employer single sign-on (OIDC, SAML 2.0, or an email-code fallback), a check against the IRS list of eligible scholarship granting organizations when a designation is made and at every deduction, and capture of the employee's state at payment

• Design reliable background job pipelines with status tracking, retry logic, dead-letter handling, and error visibility, particularly for payroll deduction sync, including webhook ingestion and drift detection between payroll systems and the platform

• Support money movement and reconciliation by building to the procedures set by ESH's finance team and working with a payments and ledgering provider such as Modern Treasury, matching payroll deduction files and ACH remittances to enrollments and keeping an audit trail

• Build compliance-aware document workflows, including year-end acknowledgement generation and delivery for donations to ESH (other scholarship granting organizations issue their own receipts from donor data the platform passes to them), with delivery status tracking and failure recovery

• Handle sensitive employee and financial data with appropriate security practices, including data minimization by design (for example, retaining only what is needed until an employee enrolls, and hashing identifiers such as email addresses)

• Make sound architecture decisions under ambiguity, balancing speed with long-term extensibility, and document decisions clearly for a small, fast-moving team
  

The Team

Engineering is a small team: the engineer who designed the platform, a part-time front-end contractor, and a part-time DevOps and security engineer being added ahead of launch.